Addison m



(No Model.)

A. M. LITTLE. MANDREL FOR KEY SEAT CUTTING MACHINES.

No. 430,133. Patented June 17, 1890.

=2, Tig l 3L0 Fig. 6

Tig- 2 7 a 2 /////////////////////////////////////////4i Wineasesltp/a-rfluf- V UNITED STATES ATENT OFFICE.

ADDISON M. LITTLE, OF MENASHA, VISOONSIN, ASSIGNOR OF ONE-HALF TO DUNCAN 'l. H. MAOKENN ON, OF SAME PLACE.

MANDREL FOR KEY-SEAT-CUTTING MACHINES.

SPECIFICATION forming part of Letters Patent No. 430,133, dated June 17', 1890.

Application filed January 28, 1890. Serial No. 338,424- (No model.)

To all whom it may concern:

Be it known that-.1, ADDISON M LITTLE, a citizen of the United States, residing at Menasha, in the county of lVinnebago and State of Visconsin, have invented a new and useful Improvement in Mandrels for Key-Seat- Out-ting Machines, of which the following is a specification.

This invention is an improvement applied [O to the key-seat-cutting machine patented to myself and Orton 0. Little, July 9, 1889, but is also applicable to any style of machine for cutting key-seats in which a mandrel having a cutting-tool reciprocative therein and entering the bore of the pulley or gear, 850., to be key-seated is used; and the object of my improvement is to provide a mandrel for said machines which is adapted for articles having a bore considerably larger than the mandrel, and consequently to prevent the necessity which now exists in key-seat-cutting machines of this class of providing a set of mandrels for each machine, one for each standard diameter of bore, in order to meet 2 5 the requirements of said standards as now established and in use throughout this country.

My invention consists of acylindricalmandreI of uniform diameter having a flange upon one of its ends, by which it is secured 0 upon the upper surface of akey-seat-cuttingmachine table at right angles to said surface, the mandrel having upon one of its sides a groove of uniform depth and having parallel sides in which a cutting-tool is arranged to be 3 5 reciprocated, and upon its opposite side a groove having like parallel sides but of a decreasing depth from its top end downward and within which a tapering key is fitted, said key being of such a taper that when inserted in the latter groove its outer edge will lie parallel with the outer edges of said groove.

Figure 1 is atop view of the mandrel; Fig.

2, a longitudinal section upon the line a; w of Fig. 1; Fig. 3, a plan of the key for insertion into the tapering groove of the mandrel; Fig.

4, a plan of a rectangular parallel-sided bar;

Fig. 5, a plan of a key-seat-cutting machine table having thereon the hereindescribed mandrel with a pulley secured thereto, and

Fig. 6, a vertical section of the same upon the line y y of Fig.5. Fig. 7 is an end view upon an enlarged scale of thehub of a pulley secured upon the mandrel, the groove in the mandrel and the key therefor being of a modified form from those shown in Figs. 1. 2, 5, and (ig'and Fig. 8,an edge view of a lever for loosening the key from the tapering groove when it is used for securinga pulley or other article upon the mandrel.

Similar figures of reference indicate like parts in the several views.

1 indicates the top or table of a key-seatcutting machine; 2, the mandrel, which may be secured thereto by means of screws or bolts through the holes 2' or other convenient manner, the upper surface of the flange 2" being flush with the surface of the table 1; 3, a groove in the mandrel of some standard Width in which the cutting-tool 4 is arranged to be reciprocated and fed to the work for producing the requisite depth of key-seat, the particular manner of producing its reciprocation and the necessary feeding movement being no part of my present invention.

5 is a tapering groove upon the opposite side of the mandrel from the groove 3, and 6 is a key adapted to fit and be driven into said tapering groove for the purpose of securing a pulley, gear, or other article to be keyseated upon the mandrel. WVithin certain limits as regards the size of bore of the article this key is all that is required for securing said article upon the mandrel.

7 is a rectangular parallel-sided bar for use in addition to the key when the bore of the article to be key-seated exceeds the limits of I the key 6.

8 is the pulley-hub, which is secured upon the mandrel and rests upon the table of the machine, the cutting-tool4 being represented as having cut the key-seat nearly or quite the necessary depth therein for a key.

9 is a lever of a curved form near one end thereof, and having near said end a pin adapted to enter one of a series of holes 6', near the wide end of the key 6, for the purpose of withdrawing said keyfrom the tapering groove 5 when it has been driven into said groove for the purpose of securing the desired article upon the table. IQO

The standard Width of keys not being uniform in theirvariation with the standards for the diameters for sh-afting, pulleys, 850., there being less of the former than of the latter, by the use of my improvement a less number of mandrels are required in a complete set, sufficient only to meet the requirements of the standards for the key widths.

No other fastening but the key 6 or, in those articles whose bore greatly exceeds the size of the mandrel, the key and the bar '7 is required for securing the article upon the table, thereby saving not only the cost of other fastening devices, but also the time nec essary for their application.

A little care by the operatorin locating the article to be key-seated upon the mandrel that the key-seat may be squarely cut in its bore, the insertion of the key 6, also the bar 7, should the size of its bore require it, and giving to the key a light blow with a hammer, secures said article in position. Its release is as quickly accomplished by means of a sudden pry with the lever 9 across the top end of the mandrel, as indicated by its position in Fig. 6.

The modification (see Fig. 7) in the form of the bottom of the tapering groove 5 and of the edge of the key 6,which is fitted therein, is made use of in the smaller sizes of mandrels for the purpose of leaving more ma; terial for preserving the strength of the mandrel While obtaining the desired depth at the sides of said groove for holding the key in its proper position in the mandrel. The bottom of said groove being made convex or a degree of swell being permitted therein toward the key, allows the necessary width to the sides of the key without the interference of one groove with the other.

I have described and shown the mandrel as havin a thin circular flan "e 2" u on its lower end, by which it is secured to the table of the machine, and also have described and shown the groove 3, in which the cutting-tool is arranged for reciprocation as being of a uniform depth; but in its application to the chine, consisting of a cylindrical portion having a uniform diameter, and a flange or part upon one end thereof for securing it upon the table of said machine, said cylindrical portion having in one side longitudinally thereof a groove adapted to receive acutting-tool reciprocative therein and upon the opposite side a groove having sides parallel one with the other, the depth of said groove being of a uniform taper from its top end downward and having a keyfitting said tapering groove of a like and uniform taper, substantially as described.

2. A mandrel for a key-seat-cutting machine, consisting of a cylindrical portion having a uniform diameter, a flange or part upon one end thereof for securing it upon the table of said machine, said cylindrical portion ha'vingin one side longitudinally thereof a groove adapted to receive a cutting-tool reciprocative therein and upon the opposite side a groove having sides parallel one with the other, the depth of said groove being of a uniform taper from its top end downward, the bottom of said groove being in its central portion and transversely thereof convex, and a key fitting said groove and being of a like and uniform taper, substantially as shown and set forth.

3. A mandrel for a key-seat-cutting machine, consisting of a cylindrical portion having a uniform diameter, and a flange or part upon one end thereof for securing it upon the table of said machine, said cylindrical portion having in one side longitudinally thereof a groove adapted to receive a cutting-tool reciprocative therein and upon its opposite side a groove having sides parallel one with the other, the depth of said groove being of a uniform taper from its top end downward and having a key fitting said tapering groove of a like and uniform taper, and in combination a lever adapted to engage and loosen the key from said groove, substantially as described.

4. A mandrel for a key-seat-cutting machine, consisting of a cylindrical portion having a uniform diameter, and a flange orpart upon one end thereof for securing it upon the table of said machine, said cylindrical portion having in one side longitudinally thereof a groove adapted to receive a cutting-tool reciprocative therein and upon its opposite side a groove having sides parallel onewith the other, the depth of said groove being of a uniform taper from its top end downward and having a key fitting said tapering groove of a like and uniform taper, and in combination the bar 7,

substantially as shown and set forth.

ADDISON M..LITTLE.

IVitnesses:

J os. L. FIEVVEGER, i HARRY DE NVoLF. 

